My cousins new girlfriend is incredibly aggravating and rude to me, if he's there or not. And when he is, he doesn't say anything to her, he just agrees and laughs. My cousin is my neighbor and tennis partner so we see a lot of each other. But I can't put up with her unnecessary and rude comments. And her and her friend continually text and call me. I'm on the verge of cussing her out. What should I do?